CVE-2022-49300
"QEMU Linux nbd Kernel Module Removal Race Condition Vulnerability"
Description
In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between nbd_alloc_config() and module removal When nbd module is being removing, nbd_alloc_config() may be called concurrently by nbd_genl_connect(), although try_module_get() will return false, but nbd_alloc_config() doesn't handle it. The race may lead to the leak of nbd_config and its related resources (e.g, recv_workq) and oops in nbd_read_stat() due to the unload of nbd module as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Call Trace: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Fixing it by checking the return value of try_module_get() in nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV), assign nbd->config only when nbd_alloc_config() succeeds to ensure the value of nbd->config is binary (valid or NULL). Also adding a debug message to check the reference counter of nbd_config during module removal.
INFO
Published Date :
Feb. 26, 2025, 7:01 a.m.
Last Modified :
April 14, 2025, 8:08 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.0
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2022-49300.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2022-49300 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2022-49300 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 14, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-362 Added CWE CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.198 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.247 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.18 up to (excluding) 5.18.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 5.17.15 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.47 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.122 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 4.14.283 Added Reference Type kernel.org: https://git.kernel.org/stable/c/122e4adaff2439f1cc18cc7e931980fa7560df5c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/165cf2e0019fa6cedc75b456490c41494c34abb4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/2573f2375b64280be977431701ed5d33b75b9ad0 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/2888fa41985f93ed0a6837cfbb06bcbfd7fa2314 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/71c142f910da44421213ade601bcbd23ceae19fa Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8a7da4ced236ce6637fe70f14ca18e718d4bf9e9 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c55b2b983b0fa012942c3eb16384b2b722caa810 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d09525720dd5201756f698bee1076de9aefd4602 Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 26, 2025
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between nbd_alloc_config() and module removal When nbd module is being removing, nbd_alloc_config() may be called concurrently by nbd_genl_connect(), although try_module_get() will return false, but nbd_alloc_config() doesn't handle it. The race may lead to the leak of nbd_config and its related resources (e.g, recv_workq) and oops in nbd_read_stat() due to the unload of nbd module as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Call Trace: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Fixing it by checking the return value of try_module_get() in nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV), assign nbd->config only when nbd_alloc_config() succeeds to ensure the value of nbd->config is binary (valid or NULL). Also adding a debug message to check the reference counter of nbd_config during module removal. Added Reference https://git.kernel.org/stable/c/122e4adaff2439f1cc18cc7e931980fa7560df5c Added Reference https://git.kernel.org/stable/c/165cf2e0019fa6cedc75b456490c41494c34abb4 Added Reference https://git.kernel.org/stable/c/2573f2375b64280be977431701ed5d33b75b9ad0 Added Reference https://git.kernel.org/stable/c/2888fa41985f93ed0a6837cfbb06bcbfd7fa2314 Added Reference https://git.kernel.org/stable/c/71c142f910da44421213ade601bcbd23ceae19fa Added Reference https://git.kernel.org/stable/c/8a7da4ced236ce6637fe70f14ca18e718d4bf9e9 Added Reference https://git.kernel.org/stable/c/c55b2b983b0fa012942c3eb16384b2b722caa810 Added Reference https://git.kernel.org/stable/c/d09525720dd5201756f698bee1076de9aefd4602
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2022-49300 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2022-49300
weaknesses.